20421100020432 has 40 divisors (see below), whose sum is σ = 52756661777184. Its totient is φ = 6806755483264.

The previous prime is 20421100020389. The next prime is 20421100020437. The reversal of 20421100020432 is 23402000112402.

It is a junction number, because it is equal to n+sod(n) for n = 20421100020399 and 20421100020408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421100020437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7493178 + ... + 9848345.

Almost surely, 2^{20421100020432} is an apocalyptic number.

It is an amenable number.

20421100020432 is an abundant number, since it is smaller than the sum of its proper divisors (32335561756752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20421100020432 is a wasteful number, since it uses less digits than its factorization.

20421100020432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17366067 (or 17366061 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20421100020432 its reverse (23402000112402), we get a palindrome (43823100132834).

The spelling of 20421100020432 in words is "twenty trillion, four hundred twenty-one billion, one hundred million, twenty thousand, four hundred thirty-two".